背景：flutter sdk 从3.0.5到3.3.4，升级也很简单终端输入flutter upgrade，回车后等待下载完成即可，在混合工作下pod install就报错了。
报错内容：
Add `flutter_post_install(installer)` to your Podfile `post_install` block to build Flutter plugins:
post_install do |installer|
flutter_post_install(installer)
end
[!] Invalid `Podfile` file: Missing `flutter_post_install(installer)` in Podfile `post_install` block.
# from /Users/adong/Documents/workspace/ios/myapp/Podfile:60
# -------------------------------------------
# # 引入flutter
> install_all_flutter_pods(flutter_application_path)
#
# -------------------------------------------
解决方法很简单：
在podfile结尾添加
target 'myapp' do
// 用的各sdk
end
// 新增的配置
post_install do |installer|
flutter_post_install(installer) if defined?(flutter_post_install)
end
